BTBooster TechLabinboostertechlab.hashnode.devDRY Principle in Java – Don’t Repeat Yourself (With Clean Code Examples)Introduction When writing production-level Java applications, code readability and maintainability matter more than just making things work.One of the most fundamental design principles that helps ach1d ago·3 min read
PPPayal Porwalincodeswithpayal.hashnode.devDay 36 – Money Tracker (Filtering, Sorting, Pagination, Validation, Frontend)By the end of Day 36, students will be able to: ✅ Filter data (income / expense)✅ Sort data (amount, latest first)✅ Use pagination (page & limit)✅ Validate input properly✅ Connect frontend (HTML/CSS/J2d ago·6 min read
NANafisa Alamincodengocool.hashnode.devAssignment vs Copy in Python — The Bug That Looks InnocentMany production bugs don’t come from complex algorithms. They come from misunderstanding how variables work. Python’s behavior around assignment is simple — but not intuitive. Variables in Python are 2d ago·2 min read
AJAkshat Jaininakshatjme.hashnode.devRate Limiting 101: How to Protect Your APIs at ScaleHow Systems Protect Themselves from Too Many Requests Modern systems don’t fail because they are badly written. They fail because they receive more requests than they can safely handle. Whether it’s an API, a backend service, or a public-facing platf...2d ago·6 min read
CBChirag Bhugrainjacked.devProduction-Grade Logging in Node.js with WinstonWhen you're building a side project, console.log is perfectly fine. But the moment you deploy a distributed system, where you have multiple instances of an app running behind a load balancer console.l3d ago·3 min read
PPPayal Porwalincodeswithpayal.hashnode.devDay 35 – Complete CRUD with MySQL (Node.js + Express)Mini Project Start: 💰 Money Tracker Day 35 Goal By the end of Day 35, students will be able to: ✅ Perform complete CRUD with MySQL✅ Create Update & Delete APIs✅ Handle errors properly (best practice3d ago·6 min read
PPPayal Porwalincodeswithpayal.hashnode.devMaster the Top SQL Queries: Clear Explanations + Practical Examples1️⃣ SELECT (Basic Data Fetching) 🔹 What it does: Fetch data from a table. 🔹 Syntax: SELECT column1, column2 FROM table_name; 🔹 Example: SELECT name, salary FROM employees; 🔹 Use Case: Showing u3d ago·5 min read
YYacineinsayiir.hashnode.devHow to build crash-proof order pipelines with durable workflowYou Charged the Customer. Then Shipping Went Down. Now What? You've seen it before. A customer places an order. Your code charges their card, reserves inventory, calls the shipping API — and the shipp4d ago·6 min read
CBChirag Bhugrainjacked.devBuilding a Validation Layer with ZodWhile building any backend API, you can never fully trust the data coming in from a client, a third-party webhook, or even a frontend application you wrote yourself. Every robust API needs a strict va4d ago·2 min read
RRRahul Rajesh Sonarinrahul-sonar.hashnode.devQuickLoan – Scalable PHP Web Application on AWS (Step-by-Step Beginner Guide)Project Overview QuickLoan is a PHP-based web application deployed on AWS using a fully scalable and highly available architecture. Tech Stack Frontend: HTML, CSS, JavaScript Backend: PHP 8.2 Web S4d ago·6 min read
